“cause to have known me would mean that there’s a new me, and if you think i’ve changed in the slightest could’ve fooled me” can someone explain what these lyrics mean?

Criminology combines the theories and insights of a number of different disciplines as well as adding its own insight about crime and criminals. do you think this interdisciplinary approach is positive or negative for understanding crime? what benefits or disadvantages might it have for the field? what other discipline do you think has the most to offer for the understanding of crime and criminals?